mutable.cpp
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/*=============================================================================
Copyright (c) 2017 Paul Fultz II
mutable.cpp
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#include <boost/hof/mutable.hpp>
#include <boost/hof/lazy.hpp>
#include <boost/hof/detail/move.hpp>
#include <memory>
#include "test.hpp"
struct mutable_fun
{
int x;
mutable_fun() noexcept
: x(1)
{}
int operator()(int i) noexcept
{
x+=i;
return x;
}
};
#if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
BOOST_HOF_TEST_CASE()
{
static_assert(noexcept(boost::hof::mutable_(mutable_fun())(3)), "noexcept mutable_");
}
#endif
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::mutable_(mutable_fun())(3) == 4);
}
BOOST_HOF_TEST_CASE()
{
auto mut_fun = mutable_fun();
auto by_5 = boost::hof::lazy(boost::hof::mutable_(std::ref(mut_fun)))(5);
BOOST_HOF_TEST_CHECK(by_5() == 6);
BOOST_HOF_TEST_CHECK(by_5() == 11);
}
struct mutable_move_fun
{
std::unique_ptr<int> x;
mutable_move_fun() : x(new int(1))
{}
int operator()(int i)
{
*x+=i;
return *x;
}
};
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::mutable_(mutable_move_fun())(3) == 4);
}
BOOST_HOF_TEST_CASE()
{
auto mut_fun = mutable_move_fun();
auto by_5 = boost::hof::lazy(boost::hof::mutable_(boost::hof::move(mut_fun)))(5);
BOOST_HOF_TEST_CHECK(by_5() == 6);
BOOST_HOF_TEST_CHECK(by_5() == 11);
}